1. Because the bottle was not washed thoroughly, there was suspended matter in the bottle, that is, physical contamination, so this bottle of wine was unqualified.

2. The beer may not be full, and this wine is also unqualified, but the wine in the bottle can be recycled.

3. The filled beer is not labeled properly when it is labeled. No matter the neck label or the belly label, the wine is unqualified, but it will be re-labeled after testing.

4, sterilization is not enough. Another important step before filling and labeling is sterilization. The main purpose of sterilization is to kill yeast and other harmful bacteria in wine and prevent beer from deteriorating in the bottle after filling. If sterilization is not in place, beer will soon go bad.

5. The quality of beer bottles is not up to standard, and the pressure is too small. When carrying, the beer will explode if it collides slightly, which may hurt people. But now, most beer bottles are of good quality.

These are basically possibilities. Among these problems, I think the most important thing is the sterilization of beer, which is a very critical step in the brewing process. Other issues are secondary. Beer will be inspected by the quality inspector on the assembly line before packaging. These quality inspectors are very professional, and they can see small impurities that ordinary people can't see at a glance. If you want to pass sterilization, you must follow all the indicators of the sterilization method you choose, such as temperature, sterilization time, etc., and you must not be careless at all.